Dickerson Portfolio Review

My name is Michael Dickerson and I'm 22 years old. I'd like to develop a portfolio that would be viable when applying for concept art jobs. Right now I'm trying to learn modeling to be able to apply for other jobs in the game industry. I'm posting a link to my portfolio http://www.michael-dickerson.com site so people can make recommendations concerning site build, sectioning, and what types of pieces I need to add. I'm going to also post 10 pieces here to get feedback on my technique. Some of these are not included in my site yet and there are some that are in my site that are not here.